EP0580881B1 - Apparatus for degassing liquids in liquid circuits - Google Patents

Apparatus for degassing liquids in liquid circuits Download PDF

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Publication number
EP0580881B1
EP0580881B1 EP19920112366 EP92112366A EP0580881B1 EP 0580881 B1 EP0580881 B1 EP 0580881B1 EP 19920112366 EP19920112366 EP 19920112366 EP 92112366 A EP92112366 A EP 92112366A EP 0580881 B1 EP0580881 B1 EP 0580881B1
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EP
European Patent Office
Prior art keywords
pressure
vessel
degassing
liquid
pressure vessel
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EP19920112366
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German (de)
French (fr)
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EP0580881A1 (en
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Roman Schreter
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A Schwarz and Co
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A Schwarz and Co
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/08—Arrangements for drainage, venting or aerating
    • F24D19/082—Arrangements for drainage, venting or aerating for water heating systems
    • F24D19/083—Venting arrangements

Definitions

  • the invention relates to a device for degassing liquids in liquid circulation systems, especially in heating or cooling systems, with a closed pressure vessel, which can be temporarily connected via lines with valves to lines of a liquid circuit so that at least a part of the liquid flow the pressure vessel flows through, which is temporarily connected to the atmosphere via a controllable valve, preferably via an expansion tank connected to the atmosphere, which can be connected to the closed pressure vessel via the controllable valve, as well as a pressure pump, in order to pressureless liquid into the liquid circuit to promote and a control unit for controlling the valves and the pressure pump, with degassing at intervals by closing the valves between the pressure vessel and the liquid circulation system and the valve between the pressure vessel ter and the atmosphere, preferably between the pressure vessel and the expansion tank is opened, with a pressure loss in the liquid circulation system being compensated for by the pressure pump after the degassing process.
  • heating or cooling of the heating fluid causes a change in volume.
  • the additional volume must be removed from the liquid circuit during heating and returned to the liquid circuit when cooling.
  • it is known to transfer the excess heating fluid caused by the thermal expansion into an open expansion vessel and to supply heating fluid to the liquid circuit again when it cools down.
  • Closed expansion tanks are also known for this purpose. Doing so Usually, when a certain overpressure in the liquid circuit is reached, a solenoid valve is opened and the heating liquid is released from the liquid circuit into the expansion tank. If the pressure in the system drops, the pressure pump is switched on and heating fluid is pumped from the expansion tank into the fluid circuit.
  • liquid in such liquid circulation systems is gaseous (the term gas includes air in this context).
  • gas includes air in this context.
  • the amount of gas in the liquid reduces heat transfer and at the same time promotes the corrosion of the system. Efforts are therefore made to degas the liquid in such systems.
  • EP-B1-0 187 683 and EP-B1-0 292 814 describe degassing devices of the type mentioned at the outset, the pressure vessels being able to be connected via valves on the one hand to the liquid circulation systems and on the other hand to the expansion vessels connected to the atmosphere. Part of the liquid of the liquid circulation system circulates through the pressure vessel during normal operation of the system. The valves are changed over at certain intervals, which are stored in the control unit, so that the pressure vessels are brought into connection with the expansion vessels connected to the atmosphere. Since the pressure in the pressure vessels, which was previously equal to the system pressure, drops to atmospheric pressure, the liquid in the pressure vessel releases gas.
  • valves are switched over and the pressure vessels are again connected to the liquid circuit into which the water which has just been degassed is returned.
  • the resulting pressure loss in the liquid circulation system becomes compensated for in that water is pumped from the expansion tank, which is connected to the atmosphere, into the pressure vessel by means of the pressure pump.
  • the system pressure is measured by a sensor in the line that leads from the pressure vessel to the liquid circulation system.
  • the object of the invention is to improve a device of the type mentioned in such a way that the degassing processes are adapted to the effective gas content in the liquid circulation system.
  • control unit determines the duration of the intervals between the degassing processes determined as a function of pressure loss in the liquid circulation system during the degassing processes.
  • control unit determines the duration of the intervals depending on the running time of the pressure pump after a degassing process.
  • the running time that the pressure pump needs to increase the system pressure that has dropped after the degassing process to a predetermined value is a good indicator of the gas content in the liquid. If the pump runs for a long time, there is a lot of gas, if the running time of the pump decreases, this means that the gas content in the liquid has decreased.
  • Another embodiment provides that a throttle is provided in the flow direction after the pressure pump and that a throttle is arranged in the line leading from the pressure vessel into the expansion tank, which is located upstream of the valve.
  • the throttle valves make the system run more smoothly.
  • the figure of the drawing shows a diagram of a device according to the invention.
  • the device according to the invention is connected to a liquid circulation system 3 via an inlet line 1 and a return line 2. It has a pressure vessel 4, the term pressure vessel being understood to mean that, during normal operation of the system, this vessel has the same pressure as prevails in the liquid circulation system 3.
  • the pressure vessel 4 is connected via a valve 5 to an expansion tank 6, which is connected to the atmosphere.
  • a throttle valve 7 is located in front of the valve 5.
  • the expansion tank 6 is connected to the fresh water line 9 via a solenoid valve 8. In the expansion tank 6 there are sensors 10 which indicate the lowest and highest water levels.
  • Another line 11 connects the pressure vessel 4 to the expansion tank 6, a pressure pump 12 being provided in this line 11. Furthermore, there is a check valve 13 in line 11, which prevents the backflow and a throttle valve 14, which serves to stabilize the pressure.
  • a check valve 15 is also provided in the discharge line 2.
  • a line 16 connects the return line 2 to the expansion tank 6 and an overflow valve 17 is arranged in this line 16.
  • a sensor 18 is located in the return line 2, which measures the system pressure.
  • a pump 19, which works as a circulation pump, a solenoid valve 20 and a filter 21 are also located in the feed line 1.
  • shut-off valves 22 which, however, are open during the entire operation of the system and have no function during the operation of the system.
  • the pressure pump 12, the pump 19 and the valves 20, 5 and 8 are controlled by a control unit 23, for example a microprocessor.
  • Drain valves 24 for the pressure vessel 4 and the expansion tank 6 are also shown in the drawing. Further parts of the device, which belong to the known prior art and have no connection with the invention, are not shown.
  • the solenoid valve 20 is closed by the control unit 23 and the pump 19 is switched off.
  • the check valve 15 closes automatically under spring action.
  • the control unit 23 opens the solenoid valve 5. Since the pressure vessel 4, which had hitherto been at the system pressure, is thereby connected to the expansion tank 6, which has atmospheric pressure, degassing occurs. After the degassing time specified by the control unit 23, for example 20 seconds, the solenoid valve 5 is closed again. It there is a pause of 1 second. If the pressure in the liquid circulation system 3, which is measured by the sensor 18, has dropped below a predetermined value, for example 0.2 bar below the optimal system pressure, the pressure pump 12 is activated, the water from the expansion tank 6 into the return line 2 and thus into the Liquid circulation system 3 pumps.
  • a predetermined value for example 0.2 bar below the optimal system pressure
  • control unit 23 receives the information from the sensor 18 that the desired system pressure has been reached, the pressure pump 12 is switched off. The solenoid valve 20 is then opened again and the pump 19 is activated, so that the water which has just been degassed is pumped out of the pressure vessel 4 into the liquid circulation system and the pressure vessel 4 is flushed again by the water of the liquid circulation system 3.
  • the control unit 23 calculates the duration of the interval until the next degassing process, i. H. until the solenoid valve 20 closes and the solenoid valve 5 opens. If the pressure pump 12 had to run for a very long time, this means that there is a lot of gas in the heat transfer fluid and the next degassing process will take place relatively soon. If the pressure pump 12 has only been running for a very short time, this means that the system has been completely or largely degassed and thus it can take a long time until the next degassing process.

Description

Die Erfindung bezieht sich auf eine Vorrichtung zur Entgasung von Flüssigkeiten in Flüssigkeitskreislaufsystemen, insbesondere bei Heizungs- oder Kühlanlagen, mit einem geschlossenen Druckbehälter, der über Leitungen mit Ventilen mit Leitungen eines Flüssigkeitskreislaufes zeitweise so in Verbindung bringbar ist, daß mindestens ein Teil des Flüssigkeitsstromes den Druckbehälter durchströmt, der über ein steuerbares Ventil zeitweise mit der Atmosphäre in Verbindung steht, vorzugsweise über ein mit der Atmosphäre in Verbindung stehendes Ausgleichsgefäß, das über das steuerbare Ventil mit dem geschlossenen Druckbehälter in Verbindung bringbar ist, sowie einer Druckpumpe, um drucklose Flüssigkeit in den Flüssigkeitskreislauf zu fördern und einer Steuereinheit zum Steuern der Ventile und der Druckpumpe, wobei in Intervallen entgast wird, indem die Ventile zwischen dem Druckbehälter und dem Flüssigkeitskreislaufsystem geschlossen und das Ventil zwischen dem Druckbehälter und der Atmosphäre, vorzugsweise zwischen dem Druckbehälter und dem Ausgleichsgefäß geöffnet wird, wobei nach dem Entgasungsvorgang ein Druckverlust im Flüssigkeitskreislaufsystem durch die Druckpumpe ausgeglichen wird.The invention relates to a device for degassing liquids in liquid circulation systems, especially in heating or cooling systems, with a closed pressure vessel, which can be temporarily connected via lines with valves to lines of a liquid circuit so that at least a part of the liquid flow the pressure vessel flows through, which is temporarily connected to the atmosphere via a controllable valve, preferably via an expansion tank connected to the atmosphere, which can be connected to the closed pressure vessel via the controllable valve, as well as a pressure pump, in order to pressureless liquid into the liquid circuit to promote and a control unit for controlling the valves and the pressure pump, with degassing at intervals by closing the valves between the pressure vessel and the liquid circulation system and the valve between the pressure vessel ter and the atmosphere, preferably between the pressure vessel and the expansion tank is opened, with a pressure loss in the liquid circulation system being compensated for by the pressure pump after the degassing process.

Es ist bekannt, daß bei Heizungsanlagen durch die Erwärmung bzw. Abkühlung der Heizungsflüssigkeit (Wasser) jeweils eine Veränderung des Volumens erfolgt. Das Mehrvolumen muß bei der Erwärmung aus dem Flüssigkeitskreislauf entnommen und bei der Abkühlung wieder in den Flüssigkeitskreislauf zurückgeführt werden. Es ist bei derartigen Heizungsanlagen bekannt, den durch die Wärmeausdehnung entstehenden Überschuß an Heizungsflüssigkeit in ein offenes Ausgleichsgefäß überzuführen und bei Abkühlung über eine Pumpe dem Flüssigkeitskreislauf wieder Heizflüssigkeit zuzuführen. Weiters sind zu diesem Zwecke auch geschlossene Ausgleichsgefäße bekannt. Dabei wird üblicherweise bei Erreichen eines bestimmten Überdruckes im Flüssigkeitskreislauf ein Magnetventil geöffnet und die Heizungsflüssigkeit aus dem Flüssigkeitskreislauf in das Ausgleichsgefäß abgegeben. Sinkt der Druck in der Anlage, wird die Druckpumpe eingeschaltet und Heizungsflüssigkeit aus dem Ausgleichsgefäß in den Flüssigkeitskreislauf gepumpt.It is known that in heating systems, the heating or cooling of the heating fluid (water) causes a change in volume. The additional volume must be removed from the liquid circuit during heating and returned to the liquid circuit when cooling. In heating systems of this type, it is known to transfer the excess heating fluid caused by the thermal expansion into an open expansion vessel and to supply heating fluid to the liquid circuit again when it cools down. Closed expansion tanks are also known for this purpose. Doing so Usually, when a certain overpressure in the liquid circuit is reached, a solenoid valve is opened and the heating liquid is released from the liquid circuit into the expansion tank. If the pressure in the system drops, the pressure pump is switched on and heating fluid is pumped from the expansion tank into the fluid circuit.

Es ist weiters bekannt, daß die Flüssigkeit in derartigen Flüssigkeitskreislaufsystemen gashältig ist (der Begriff Gas schließt in diesem Zusammenhang Luft ein). Die Gasmenge in der Flüssigkeit vermindert den Wärmetransport und fördert gleichzeitig die Korrosion der Anlage. Man ist daher bestrebt, die Flüssigkeit in derartigen Anlagen zu entgasen.It is also known that the liquid in such liquid circulation systems is gaseous (the term gas includes air in this context). The amount of gas in the liquid reduces heat transfer and at the same time promotes the corrosion of the system. Efforts are therefore made to degas the liquid in such systems.

Die EP-B1-0 187 683 und die EP-B1-0 292 814 beschreiben Entgasungsvorrichtungen der eingangs erwähnten Art, wobei die Druckbehälter über Ventile einerseits mit den Flüssigkeitskreislaufsystemen und andererseits mit den mit der Atmosphäre in Verbindung stehenden Ausgleichsgefäßen in Verbindung bringbar sind. Dabei zirkuliert während des normalen Betriebes der Anlage ein Teil der Flüssigkeit des Flüssigkeitskreislaufsystem durch den Druckbehälter. In bestimmten Intervallen, die in der Steuereinheit gespeichert sind, werden die Ventile umgestellt, sodaß die Druckbehälter mit den mit der Atmosphäre in Verbindung stehenden Ausgleichsgefäßen in Verbindung gebracht werden. Da dabei der Druck in den Druckbehältern, der vorher gleich dem Anlagendruck war, auf Atmosphärendruck absinkt, gibt die im Druckbehälter befindliche Flüssigkeit Gas ab. Nach erfolgten Entgasungsvorgang werden die Ventile umgeschalten und die Druckbehälter wiederum mit dem Flüssigkeitskreislauf in Verbindung gebracht, in den das soeben entgaste Wasser zurückgeführt wird. Der dabei entstehende Druckverlust im Flüssigkeitskreislaufsystem wird dadurch ausgeglichen, daß mittels der Druckpumpe Wasser von dem mit der Atmosphäre in Verbindung stehenden Ausgleichsgefäß in den Druckbehälter gepumpt wird.EP-B1-0 187 683 and EP-B1-0 292 814 describe degassing devices of the type mentioned at the outset, the pressure vessels being able to be connected via valves on the one hand to the liquid circulation systems and on the other hand to the expansion vessels connected to the atmosphere. Part of the liquid of the liquid circulation system circulates through the pressure vessel during normal operation of the system. The valves are changed over at certain intervals, which are stored in the control unit, so that the pressure vessels are brought into connection with the expansion vessels connected to the atmosphere. Since the pressure in the pressure vessels, which was previously equal to the system pressure, drops to atmospheric pressure, the liquid in the pressure vessel releases gas. After the degassing process has taken place, the valves are switched over and the pressure vessels are again connected to the liquid circuit into which the water which has just been degassed is returned. The resulting pressure loss in the liquid circulation system becomes compensated for in that water is pumped from the expansion tank, which is connected to the atmosphere, into the pressure vessel by means of the pressure pump.

Der Anlagendruck wird dabei von einem Sensor in der Leitung, die vom Druckbehälter zum Flüssigkeitskreislaufsystem führt, gemessen.The system pressure is measured by a sensor in the line that leads from the pressure vessel to the liquid circulation system.

Der Nachteil der soeben beschriebenen Vorrichtungen ist insbesondere darin zu sehen, daß die Entgasungsvorgänge in gleichbleibenden Intervallen erfolgen. Ein weiterer Nachteil ist bei der Ausführung gemäß der EP-B1-0 292 814 darin zu sehen, daß es bedingt durch die Verwendung eines Dreiwegeventiles am Anfang und am Ende eines jeden Entgasungsvorganges nicht zu einem exakten Umschalten kommt.The disadvantage of the devices just described can be seen in particular in the fact that the degassing processes take place at constant intervals. Another disadvantage of the design according to EP-B1-0 292 814 is that, due to the use of a three-way valve, there is no exact switching at the beginning and at the end of each degassing process.

Es ist bekannt, daß der Gasanteil in der Flüssigkeit des Flüssigkeitskreislaufsystems beispielsweise bei einer Zentralheizungsanlage während der Betriebsdauer der Heizungsanlage unterschiedlich ist. So wird z. B. bei der Inbetriebnahme der Anlage im Herbst der Gasanteil am größten sein und bedingt durch die laufend erfolgende Entgasung abnehmen. Bei einer Vorrichtung der zuvor genannten Art werden die Entgasungsvorgänge jedoch auch dann durchgeführt, wenn kein oder nur sehr wenig Gas in der Flüssigkeit vorhanden ist. Dies bringt Energieverluste mit sich und führt auch zu einer übermäßigen Beanspruchung und daher kürzerer Lebensdauer der Vorrichtung.It is known that the proportion of gas in the liquid of the liquid circulation system, for example in a central heating system, is different during the operating time of the heating system. So z. B. when starting up the plant in autumn, the gas percentage is the largest and decrease due to the ongoing degassing. In a device of the aforementioned type, however, the degassing processes are also carried out when there is no or very little gas in the liquid. This entails energy losses and also leads to excessive stress and therefore a shorter service life of the device.

Aufgabe der Erfindung ist es, eine Vorrichtung der eingangs erwähnten Art dermaßen zu verbessern, daß die Entgasungsvorgänge dem effektiven Gasanteil im Flüssigkeitskreislaufsystem angepaßt werden.The object of the invention is to improve a device of the type mentioned in such a way that the degassing processes are adapted to the effective gas content in the liquid circulation system.

Dies wird erfindungsgemäß dadurch erreicht, daß die Steuereinheit die Dauer der Intervalle zwischen den Entgasungsvorgängen in Abhängigkeit von Druckverlust im Flüssigkeitskreislaufsystem während der Entgasungsvorgänge bestimmt.This is achieved according to the invention in that the control unit determines the duration of the intervals between the degassing processes determined as a function of pressure loss in the liquid circulation system during the degassing processes.

Vorteilhaft ist vorgesehen, daß die Steuereinheit die Dauer der Intervalle in Abhängigkeit von der Laufzeit der Druckpumpe nach einem Entgasungsvorgang bestimmt.It is advantageously provided that the control unit determines the duration of the intervals depending on the running time of the pressure pump after a degassing process.

Die Laufzeit, die die Druckpumpe braucht, um den nach dem Entgasungsvorgang abgesunkenen Anlagendruck wieder auf einen vorgegebenen Wert zu erhöhen, ist ein guter Indikator für den Gasanteil in der Flüssigkeit. Läuft die Pumpe lange, ist sehr viel Gas vorhanden, nimmt die Laufzeit der Pumpe ab, bedeutet dies, daß der Gasanteil in der Flüssigkeit abgenommen hat.The running time that the pressure pump needs to increase the system pressure that has dropped after the degassing process to a predetermined value is a good indicator of the gas content in the liquid. If the pump runs for a long time, there is a lot of gas, if the running time of the pump decreases, this means that the gas content in the liquid has decreased.

Ein weiteres Ausführungsbeispiel sieht vor, daß in Strömungsrichtung nach der Druckpumpe eine Drossel vorgesehen ist und daß in der Leitung, die vom Druckbehälter in das Ausgleichsgefäß führt, eine Drossel angeordnet ist, die sich in Strömungsrichtung vor dem Ventil befindet. Die Drosselventile bewirken, daß die Anlage ruhiger läuft.Another embodiment provides that a throttle is provided in the flow direction after the pressure pump and that a throttle is arranged in the line leading from the pressure vessel into the expansion tank, which is located upstream of the valve. The throttle valves make the system run more smoothly.

Nachfolgend wird ein Ausführungsbeispiel der Erfindung an Hand der Figur der Zeichnung beschrieben.An embodiment of the invention is described below with reference to the figure of the drawing.

Die Figur der Zeichnung zeigt ein Schema einer erfindungsgemäßen Vorrichtung.The figure of the drawing shows a diagram of a device according to the invention.

Die erfindungsgemäße Vorrichtung ist über eine Zulaufleitung 1 und eine Rücklaufleitung 2 mit einem Flüssigkeitskreislaufsystem 3 verbunden. Sie weist einen Druckbehälter 4 auf, wobei der Begriff Druckbehälter dahingehend verstanden werden soll, daß dieser Behälter bei normalen Betrieb der Anlage den gleichen Druck, wie er im Flüssigkeitskreislaufsystem 3 herrscht, aufweist.The device according to the invention is connected to a liquid circulation system 3 via an inlet line 1 and a return line 2. It has a pressure vessel 4, the term pressure vessel being understood to mean that, during normal operation of the system, this vessel has the same pressure as prevails in the liquid circulation system 3.

Der Druckbehälter 4 ist über ein Ventil 5 mit einem Ausgleichsgefäß 6 verbunden, das mit der Atmosphäre in Verbindung steht. Vor dem Ventil 5 befindet sich ein Drosselventil 7.The pressure vessel 4 is connected via a valve 5 to an expansion tank 6, which is connected to the atmosphere. A throttle valve 7 is located in front of the valve 5.

Das Ausgleichsgefäß 6 ist über ein Magnetventil 8 mit der Frischwasserleitung 9 verbunden. Im Ausgleichsgefäß 6 befinden sich Sensoren 10, die den untersten und obersten Wasserstand anzeigen.The expansion tank 6 is connected to the fresh water line 9 via a solenoid valve 8. In the expansion tank 6 there are sensors 10 which indicate the lowest and highest water levels.

Eine weitere Leitung 11 verbindet den Druckbehälter 4 mit dem Ausgleichsgefäß 6, wobei in dieser Leitung 11 eine Druckpumpe 12 vorgesehen ist. Weiters befindet sich in der Leitung 11 ein Rückschlagventil 13, das den Rückfluß verhindert und ein Drosselventil 14, das der Druckstabilisierung dient.Another line 11 connects the pressure vessel 4 to the expansion tank 6, a pressure pump 12 being provided in this line 11. Furthermore, there is a check valve 13 in line 11, which prevents the backflow and a throttle valve 14, which serves to stabilize the pressure.

In der Ablaufleitung 2 ist ebenfalls ein Rückschlagventil 15 vorgesehen. Eine Leitung 16 verbindet die Rücklaufleitung 2 mit dem Ausgleichsgefäß 6 und in dieser Leitung 16 ist ein Überströmventil 17 angeordnet.A check valve 15 is also provided in the discharge line 2. A line 16 connects the return line 2 to the expansion tank 6 and an overflow valve 17 is arranged in this line 16.

Weiters befindet sich bei der Rücklaufleitung 2 ein Sensor 18, der den Anlagendruck mißt.Furthermore, a sensor 18 is located in the return line 2, which measures the system pressure.

In der Zulaufleitung 1 befinden sich weiters eine Pumpe 19, die als Umlaufpumpe arbeitet, ein Magnetventil 20 und ein Filter 21.A pump 19, which works as a circulation pump, a solenoid valve 20 and a filter 21 are also located in the feed line 1.

Weiters sind die Zulaufleitung 1 und die Ablaufleitung 2 mit Sperrventilen 22 versehen, die jedoch während des gesamten Betriebes der Anlage offen sind und während des Betriebes der Anlage keine Funktion ausüben.Furthermore, the inlet line 1 and the outlet line 2 are provided with shut-off valves 22, which, however, are open during the entire operation of the system and have no function during the operation of the system.

Die Druckpumpe 12, die Pumpe 19 und die Ventile 20, 5 und 8 werden von einer Steuereinheit 23, beispielsweise einem Mikroprozessor gesteuert.The pressure pump 12, the pump 19 and the valves 20, 5 and 8 are controlled by a control unit 23, for example a microprocessor.

In der Zeichnung sind noch Ablaßventile 24 für den Druckbehälter 4 und das Ausgleichsgefäß 6 eingezeichnet. Weitere Teile der Vorrichtung, die zum bekannten Stand der Technik gehören und in keinem Zusammenhang mit der Erfindung stehen, sind nicht eingezeichnet.Drain valves 24 for the pressure vessel 4 and the expansion tank 6 are also shown in the drawing. Further parts of the device, which belong to the known prior art and have no connection with the invention, are not shown.

Beim normalen Betrieb der Anlage, d. h. zwischen den Entgasungsvorgängen fließt Wasser aus dem Flüssigkeitskreislaufsystem 3 über die Zulaufleitung 1 in den Druckbehälter 4 und über die Rücklaufleitung 2 zurück in das Flüssigkeitskreislaufsystem 3. Dieser Durchfluß kann allein von der Umwälzpumpe im Flüssigkeitskreislaufsystem 3 bzw. der Drosselwirkung im Wärmenutzungssystem 25 hervorgerufen werden. Die Pumpe 19 unterstützt den Durchfluß des Wassers durch den Druckbehälter 4 bzw. stellt diesen auch dann sicher, wenn die erfindungsgemäße Vorrichtung nicht optimal an das Flüssigkeitskreislaufsystem 3 angeschlossen wurde.During normal operation of the system, i.e. H. between the degassing processes, water flows from the liquid circulation system 3 via the inlet line 1 into the pressure vessel 4 and via the return line 2 back into the liquid circulation system 3. The pump 19 supports the flow of water through the pressure vessel 4 or ensures this even if the device according to the invention has not been optimally connected to the liquid circulation system 3.

Zur Einleitung des Entgasungsvorganges wird das Magnetventil 20 von der Steuereinheit 23 geschlossen und die Pumpe 19 abgestellt. Das Rückschlagventil 15 schließt automatisch unter Federwirkung.To initiate the degassing process, the solenoid valve 20 is closed by the control unit 23 and the pump 19 is switched off. The check valve 15 closes automatically under spring action.

Anschließend erfolgt eine Pause von 1 Sekunde, worauf von der Steuereinheit 23 das Magnetventil 5 geöffnet wird. Da dadurch der Druckbehälter 4, der bis dahin den Anlagendruck aufgewiesen hat, mit dem Ausgleichsgefäß 6, das Atmosphärendruck aufweist, in Verbindung gebracht wird, kommt es zu einer Entgasung. Nach der von der Steuereinheit 23 vorgegebenen Entgasungszeit, beispielsweise 20 Sekunden, wird das Magnetventil 5 wieder geschlossen. Es folgt eine Pause von 1 Sekunde. Ist der Druck im Flüssigkeitskreislaufsystem 3, der vom Sensor 18 gemessen wird, unter einen vorgegebenen Wert, beispielsweise 0,2 bar unter dem optimalen Anlagendruck abgesunken, wird die Druckpumpe 12 aktiviert, die Wasser aus dem Ausgleichsgefäß 6 in die Rücklaufleitung 2 und somit in das Flüssigkeitskreislaufsystem 3 pumpt. Erhält die Steuereinheit 23 vom Sensor 18 die Information, daß der gewünschte Anlagendruck erreicht ist, wird die Druckpumpe 12 abgestellt. Anschließend wird wiederum das Magnetventil 20 geöffnet und die Pumpe 19 aktiviert, sodaß das soeben entgaste Wasser aus dem Druckbehälter 4 in das Flüssigkeitskreislaufsystem abgepumpt wird und der Druckbehälter 4 wieder vom Wasser des Flüssigkeitskreislaufsystems 3 durchspült wird.Then there is a pause of 1 second, after which the control unit 23 opens the solenoid valve 5. Since the pressure vessel 4, which had hitherto been at the system pressure, is thereby connected to the expansion tank 6, which has atmospheric pressure, degassing occurs. After the degassing time specified by the control unit 23, for example 20 seconds, the solenoid valve 5 is closed again. It there is a pause of 1 second. If the pressure in the liquid circulation system 3, which is measured by the sensor 18, has dropped below a predetermined value, for example 0.2 bar below the optimal system pressure, the pressure pump 12 is activated, the water from the expansion tank 6 into the return line 2 and thus into the Liquid circulation system 3 pumps. If the control unit 23 receives the information from the sensor 18 that the desired system pressure has been reached, the pressure pump 12 is switched off. The solenoid valve 20 is then opened again and the pump 19 is activated, so that the water which has just been degassed is pumped out of the pressure vessel 4 into the liquid circulation system and the pressure vessel 4 is flushed again by the water of the liquid circulation system 3.

Aus der Dauer der Laufzeit der Druckpumpe 12 errechnet die Steuereinheit 23 die Dauer des Intervalls bis zum nächsten Entgasungsvorgang, d. h. bis zum Schließen des Magnetventiles 20 und öffnen des Magnetventiles 5. Hat die Druckpumpe 12 sehr lange laufen müssen, heißt dies, daß sich viel Gas in der Wärmeträgerflüssigkeit befindet und der nächste Entgasungsvorgang wird relativ bald erfolgen. Ist die Druckpumpe 12 nur sehr kurz gelaufen, bedeutet dies, daß die Anlage gänzlich oder weitgehendst entgast ist und somit kann längere Zeit bis zum nächsten Entgasungsvorgang verstreichen.From the duration of the running time of the pressure pump 12, the control unit 23 calculates the duration of the interval until the next degassing process, i. H. until the solenoid valve 20 closes and the solenoid valve 5 opens. If the pressure pump 12 had to run for a very long time, this means that there is a lot of gas in the heat transfer fluid and the next degassing process will take place relatively soon. If the pressure pump 12 has only been running for a very short time, this means that the system has been completely or largely degassed and thus it can take a long time until the next degassing process.

Claims (6)

  1. Apparatus for degassing liquids in liquid circuit systems, in particular in heating or cooling installations, having a closed pressure vessel (4) which at times can be brought into communication by way of conduits (1, 2) with valves (15, 20) with conduits of a liquid circuit (3) in such a way that at least a part of the flow of liquid flows through the pressure vessel (4) which at times is communicated with the atmosphere by way of a controllable valve (5), preferably by way of a balancing vessel (6) which is in communication with the atmosphere and which can be comnunicated with the closed pressure vessel (4) by way of the controllable valve (5), and a pressure pump (12) for conveying pressure-less liquid into the liquid circuit (3) and a control unit (23) for controlling the valves (5, 20) and the pressure pump (12), wherein degassing is effected at intervals by the valves (15, 20) between the pressure vessel (4) and the liquid circuit system (3) being closed and the valve (5) between the pressure vessel (4) and the atmosphere, preferably between the pressure vessel (4) and the balancing vessel (6) being opened, wherein after the degassing operation a pressure loss in the liquid circuit system (3) is compensated by the pressure pump (12), characterised in that the control unit (23) determines the duration of the intervals between the degassing operations in dependence on pressure loss in the liquid circuit system (3) during the degassing operations.
  2. Apparatus according to claim 1 characterised in that the control unit (23) determines the duration of the intervals in dependence on the running time of the pressure pump (12) after a degassing operation.
  3. Apparatus according to claim 2 characterised in that a throttle (13) is provided downstream of the pressure pump (12) in the flow direction.
  4. Apparatus according to claim 2 characterised in that disposed in the conduit which leads from the pressure vessel (4) into the balancing vessel (6) is a throttle (7) which is arranged upstream of the valve (5) in the flow direction.
  5. Apparatus according to claim 1 characterised in that a pressure gauge (18) which is connected to the control unit (23) is provided in per se known manner, preferably in a conduit which connects the pressure vessel (4) to the conduits of the liquid circuit system (3).
  6. Apparatus according to claim 2 characterised in that the pressure pump (12) is activated by the control unit (23) when the installation pressure of the liquid circuit system (3) falls below the optimum pressure by at least 0.2 bar.
EP19920112366 1991-04-24 1992-07-20 Apparatus for degassing liquids in liquid circuits Expired - Lifetime EP0580881B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE59200229T DE59200229D1 (en) 1992-07-20 1992-07-20 Device for degassing liquids in liquid circulation systems.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT85191A AT396521B (en) 1991-04-24 1991-04-24 DEVICE FOR DEGASSING LIQUIDS IN LIQUID CIRCUIT SYSTEMS

Publications (2)

Publication Number Publication Date
EP0580881A1 EP0580881A1 (en) 1994-02-02
EP0580881B1 true EP0580881B1 (en) 1994-06-08

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920112366 Expired - Lifetime EP0580881B1 (en) 1991-04-24 1992-07-20 Apparatus for degassing liquids in liquid circuits

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EP (1) EP0580881B1 (en)
AT (1) AT396521B (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT401293B (en) * 1994-01-14 1996-07-25 Schwarz A & Co METHOD AND DEVICE FOR DEGASSING THE LIQUID IN A LIQUID CIRCUIT
CZ293695B6 (en) 1997-11-26 2004-07-14 A. Schwarz + Co. Degasification process and apparatus for making the same
AT408585B (en) * 1997-12-16 2002-01-25 Schwarz A & Co Method of controlling a device for maintaining pressure and degassing a liquid circulating in a liquid circulation system, in particular of a heating plant
BE1023923B1 (en) * 2016-02-25 2017-09-19 Sercal Belgium Bvba METHOD AND DETECTOR FOR DETECTING AIR BUBBLES OR AIR CONCLUSIONS IN A SYSTEM, AS WELL AS AN INSTALLATION CONTAINING SUCH DETECTOR
EP4025837A1 (en) * 2019-09-03 2022-07-13 Flamco B.V. Liquid replenishing system and method of replenishing
NL2025076B1 (en) * 2019-09-03 2021-04-13 Flamco Bv Liquid replenishing system and method of replenishing
AT524772B1 (en) 2021-05-21 2022-09-15 Olymp Werk Gmbh Additional device for temperature control system and temperature control system with disinfection unit
WO2023203029A1 (en) * 2022-04-20 2023-10-26 Grundfos Holding A/S A method and system for degassing liquid

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3237023A1 (en) * 1982-10-06 1984-04-12 H.F. 8036 Herrsching Bernstein DEGASSING DEVICE FOR LIQUID FLOWS
DE3716396A1 (en) * 1987-05-15 1988-12-15 Hans Friedrich Bernstein EXPANSION AND PRESSURE HOLDING DEVICE FOR CIRCULATING LIQUID FLOWS
GB8721090D0 (en) * 1987-09-08 1987-10-14 Pressure Units Ltd Central heating system

Also Published As

Publication number Publication date
ATA85191A (en) 1993-01-15
EP0580881A1 (en) 1994-02-02
AT396521B (en) 1993-10-25

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